爱迪生因众多的发明而誉满四海,一个年轻的人慕名前往求教。他信心百倍地对爱迪生说：“我立志要发明一种‘万能溶液’,它可以溶解一切物品。”爱迪生听后微笑地说：“你的理想很好,不过,你将用什么器皿来放置这种‘万能溶液’呢？……我看你只能成为一个不能自圆其说的发明家。”年轻人听了, 不觉满面羞愧。年轻人这番话之所以不能自圆其说,是由于他违反了思维的四大规律之一“矛盾律”。“矛盾律”是客观事物质的规定性的反映, 是一条关于思维确定性的规定。它认为：“在同一思维过程中,一个思想的肯定及其否定不能同时是真的。”这位年轻人如果真的发明了“万能溶液”,那么,放置这种溶液的器 Edison because of numerous inventions and world-renowned, a young man admired to seek advice. He confidently said to Edison: “I decided to invent a ’universal solution’ that dissolves everything.” Edison smiled and said, “Your ideal is good, but what kind of vessel are you going to place This ’universal solution’? ... I think you can only become an inventor can not be justified. ”Young people listened, unhappy face shame. The reason why young people can not justify these remarks is because they violated one of the four laws of thinking: the law of contradictions. “Law of contradiction” is a reflection of the materiality of objective things and a provision on the certainty of thinking. It states: “In the same thinking process, the affirmation of one thought and its negation can not be true at the same time.” If this young man really invented the “universal solution,” then the device